In Ear Wireless Monitor - Receiver Vhf. Takstar

In Ear Wireless Monitor - Receiver, VHF. TAKSTAR
             RF Frequency: 433 - 433.6MHz
       Transmitting Range: 30 Meters, 30dB
                S/N Ratio: >45dB
             Power Supply: 12VDC

1 Transmitter to Multiple Receivers
Note: This is just the receiver which is usually bought if you already have a transmitter.